The infant universeAn all-sky picture of the infant universe revealing 13.77 billion-year-old temperature fluctuations (shown as color differences) that correspond to the seeds that grew to become the galaxies. (Credit: NASA/WMAP Science Team)

Astrophysics is a branch of astronomy that explores the physical properties of the cosmos and its composition. Astrophysicists study a broad range of topics, from the tiniest particles of matter and the forces that join them together to the grandest of celestial structures. In essence, astrophysics extends the workings of physics and chemistry that we experience directly here on Earth into the vastness of space. It is both an observational and theoretical science. To probe the universe's past, present and future, astrophysicists have built some of the most complex and precise machines in the world, including terrestrial and space-based telescopes tuned to various wavelengths. The continued seeking of new discoveries is constantly pushing the limits of telescope and model-building technology. 

Primordial Portrait of the Universe

Jul 14, 2010
Planck space telescope

Central to the science of cosmology is the zeal to build better time machines. These are not designed literally to travel to the distant past, of course, but to get a better look at it. The latest of these is the Planck Surveyor satellite. 

Wonder as a Motivator

May 20, 2010

In a special essay, KIPAC Director Roger Blandford discusses how wonder and curiosity has inspired his own life, and serves as a creative force to both science and the humanities.

Probing the Universe: Kavli Institute for Cosmology Cambridge

May 01, 2010

To help answer some of the most fundamental questions about the Universe, researchers at KICC are members of international collaborations that are making use of some the most advanced scientific instruments ever constructed.

Risa Wechsler: Shedding Light on the Dark Side

Apr 09, 2010
Ruth Weschler

Risa Wechsler, a member of the Kavli Institute for Particle Physics and Cosmology (KIPAC) at Stanford University, has a career path that has led to three Kavli institutes and one program, giving her particularly extensive roots in the Kavli community.

Colorado Bound: The Pierre Auger Project

Jan 01, 2010

In southeastern Colorado, a land better known for crops and livestock may soon host the world's largest astrophysical detector. If an international consortium of scientists gets a green light from funding agencies, it will build an array for detecting cosmic rays.

Chao-Lin Kuo Heads South

Apr 01, 2009
Chao-Lin Kuo

To get to the South Pole, first take a commercial flight to Christchurch, New Zealand, then catch a special military flight to McMurdo Station, a large outpost on the Antarctic coast. From there it's a three-hour flight to Amundsen-Scott South Pole Station. 

Blowing in the Wind

Sep 29, 2008

The next time you walk outside on a calm summer night and look up at the constellation Cygnus, also known as the Northern Cross, consider what is coming at you. 

Eyeing Dark Energy

Feb 29, 2008
South Pole Telescope

Frigid and bone-dry, with six straight months of night each year, the South Pole is a forbidding place to live or work. However, it’s one of the best spots on the planet for surveying the faint cosmic microwave background (CMB) radiation left over from the Big Bang. 

On the GLAST Track

Aug 01, 2007
Gamma Ray Large Area Space Telescope

There’s far more to the universe than meets the eye. Astronomers have long known this, and much of their big-budget work for the past several decades, from radio telescopes to orbiting observatories, has the goal of “seeing” the cosmos on wavelengths that are inaccessible to human sight.

Frontiers in Astrophysics

Jun 25, 2007

How did the universe begin? When—or for that matter will—it end? Answering questions about our very existence is often at the heart of astrophysics.


Subscribe to RSS - Astrophysics